Okay, so, here's the fangirl in me XD ...And some SPOILERS!
When Roy first came to Rizenbul, I thought it wasn't actually to meet Ed and Al and deliver a note as he used as an
excuse, but to admit what he did to Winry's parents. And when he first comes in, Ed and Al are completely
distraught, having lost limb and nearly life. So when Roy proposes the idea of the military and getting their bodies
back, it's like a second chance for them. You can only wonder what might have happened if Roy had never showed up.
They might not have burned down their house, and left everything behind like they did. And at the same time, it was like
redemption for Roy, because while he sort of destroyed Winry's happy family life, he was able to give hope to Ed
and Al again after losing their mother a second time.
And that's why I made that background, cause I see it as a turning point for all three of them.
/fangirl rant